G - Physics – 08 – C
Patent
G - Physics
08
C
340/136, 354/236
G08C 21/00 (2006.01) G06F 3/03 (2006.01) G06F 3/033 (2006.01) G06F 3/037 (2006.01) H03M 1/30 (2006.01) H03M 1/00 (2006.01)
Patent
CA 2017486
Abstract of the Invention An apparatus and method for optical encoding is disclosed. An electrical input means is provided for providing a pulsed electrical input signal. A light source means is connected to the pulsed electrical input means for utilizing the pulsed electrical input signal to produce pulses of light. Light collecting and electrical conducting means is provided and synchronized with the light source means. The light collecting and electrical conducting means is positioned in relation to the light source means for receiving and being responsive to light produced by the pulsed light source means. An electrical output signal is produced, indicating such a response. Positionable light interrupting means is provided for opening and closing the optical path of light being transmitted from the light source means to the light collecting and electrical conducting means. The opening and closing affects the electrical output signal, the resulting pulsed electrical output signal for use in encoding. The apparatus results in minimized power consumption as a result of the pulsed synchronization of the light source means and the light collecting and electrical conducting means. The present invention is particularly adaptable for use with cursor control devices for computer controlled display systems. LNG/mg/04860.P158 4/28/89
Apple Computer Inc.
Riches Mckenzie & Herbert Llp
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